ADS822
ADS825
®
10-Bit, 40MHz Sampling
ANALOG-TO-DIGITAL CONVERTERS
FEATURES
l HIGH SNR: 60dB
l HIGH SFDR: 72dBFS
l LOW POWER: 190mW
l INTERNAL/EXTERNAL REFERENCE OPTION
l SINGLE-ENDED OR
FULLY DIFFERENTIAL ANALOG INPUT
l PROGRAMMABLE INPUT RANGE
l LOW DNL: 0.5LSB
l SINGLE +5V SUPPLY OPERATION
l +3V OR +5V LOGIC I/O COMPATIBLE (ADS825)
l POWER DOWN: 20mW
l 28-LEAD SSOP PACKAGE
APPLICATIONS
l MEDICAL IMAGING
l TEST EQUIPMENT
l COMPUTER SCANNERS
l COMMUNICATIONS
l VIDEO DIGITIZING
DESCRIPTION
The ADS822 and ADS825 are pipeline, CMOS analog-to-digital
converters that operate from a single +5V power supply. These
converters provide excellent performance with a single-ended
input and can be operated with a differential input for added
spurious performance. These high-performance converters in-
clude a 10-bit quantizer, high-bandwidth track-and-hold, and a
high-accuracy internal reference. They also allow for the user to
disable the internal reference and utilize external references. This
external reference option provides excellent gain and offset
matching when used in multi-channel applications or in applica-
tions where full-scale range adjustment is required.
The ADS822 and ADS825 employ digital error correction tech-
niques to provide excellent differential linearity for demanding
imaging applications. Its low distortion and high SNR give the
extra margin needed for medical imaging, communications,
video, and test instrumentation. The ADS822 and ADS825 offer
power dissipation of 190mW and also provide a power-down
mode, thus reducing power dissipation to only 20mW. The
ADS825 is +3V or +5V Logic I/O compatible.
The ADS822 and ADS825 are specified at a maximum sampling
frequency of 40MHz and a single-ended input range of 1.5V to
3.5V. The ADS822 and ADS825 are available in a 28-lead SSOP
package and are pin-for-pin compatible with the 10-bit, 60MHz
ADS823 and ADS826, and the 10-bit, 70MHz ADS824, provid-
ing an upgrade path to higher sampling frequencies.
TM
©
1997 Burr-Brown Corporation PDS-1385E Printed in U.S.A. October, 1999
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
For most current data sheet and other product
information, visit www.burr-brown.com
10-Bit
Pipelined
A/D Core
Internal
Reference
Optional External
Reference
Timing
Circuitry
Error
Correction
Logic
3-State
Outputs
T/H
CLK VDRV
ADS822
ADS825
+V
S
OEPDInt/Ext
D0
D9
•
•
•
INV
IN
IN
CM
ADS822
ADS825